| REFERENCE NUMBER DIFFERENTIATING CHARACTERISTICS | 3REQUIRED CHEMICAL CONTENT COPPER PLUS SILVER 99.96 PCT MIN MAX IMPORITIES LIMITATIONS,LEAD 0.0010 PCT,MERCURY 0.0001 PCT,PHOSPHORUS 0.0003 PCT,SULPHUR 0.0040 PCT,ZINC 0.0003 PCT,TOTAL OTHER ELEMENTS 0.0343 PCT 4 IN. THK,13 IN. W,39 IN. LG CAKE |